water-beetles of Japan. 447 



commencement of this sexual peculiarity. The female 

 differs from the male also in having the thorax finely 

 punctured all over, as in the corresponding sex of 

 D. punctulatus, the punctures being, however, less dense 

 than in D. punctulatus. 



Hydaticiis thermonectoides. 

 Breviter ovalis, anterius atteniiatus, convexus, fernigineus, ely- 

 tris nigi-o-irroratis, irrorationibus post medium in fascias duabus 

 nigras condeusatis. Long. 10 mm., lat. 6 mm. 



The unique specimen, a female, seems to indicate a 

 Hydaticus of peculiarly short form, somewhat similar to 

 a Thermoncctes or Rhantaticus in appearance, to be placed 

 ne^Y Hydaticus ponticus. There is no black marking on 

 the head and thorax ; the elytra show very indistinct 

 longitudinal lines of yellow among the black specks ; 

 the hmd legs are remarkably short. The upper surface 

 has a distinct fine punctuation, but unless this be 

 characteristic of the female there is no sexual sculpture. 

 The species may be readily distinguished from H. rlian- 

 toides by the broad shape and the different markings on 

 the wing-cases. 



Found on the Wada Pass. 



Sandracottus hunteri. 



A single example of this well-known species has 

 occurred in Higo. 



GYEINIDiE. 

 Gyriniis japonicus. 



Gyrimis japonicus, Sharp, Trans. Ent. Soc. Lond 



1873, p. 55. 

 G. curtus, Eegt., Ann. Soc. Fr., 1882, p. 168 (nee 



Motsch.). 



This has been brought from Yokohama by Mr. Lewis, 

 and the series now found shows that the species should 

 be placed in the section with dark epipleurge, although 

 in certain examples a faint rusty colour is ajjparent on 

 the piddle of the basal portion of these parts. The 

 species is remarkable on account of a very distinct 

 sexual sculpture existing in the female, a large portion 

 of each wing-case being covered in that sex by a patch 



